Question

A) x + y = 7 5x - 2y = -7
b) 4x + 3y = 10 5x - 6y = -7

Answer 1

Respuesta:

A)

x + y = 7

5x - 2y = -7

x=7-y

5(7-y)-2y=-7

35-5y-2y=-7

7y=42

y=42/7=6

y=6

x=7-y

x=7-6=1

x=1

B)

4x + 3y = 10

5x - 6y = -7

8x + 6y = 20

5x - 6y = -7

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13x =13

x=13/13=1

x=1

4x+3y=10

4(1)+3y=10

4+3y=10

3y=6

y=6/3=2

y=2

Answer 2

solo hice el ejercicio 1, lo siento :(